Maker and electrical engineer Allen Pan of the Sufficiently Advanced YouTube channel built this custom hammer modeled after Thor's Mjölnir which uses an electromagnet to create a strong magnetic field that secures the hammer on any metal surface. The catch is that only Pan's own fingerprint can deactivate the magnet. Here's how it works:
- A capacitive touch sensor (fingerprint sensor) attached to the handle
- An Arduino Pro Mini and a solid state relay, which serves as a switching device.
- A microwave oven transformer electromagnet that uses electricity to produce a very strong magnetic field